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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 244 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 199 + 704 + 296? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  2. 2.Which is closest to 604 + 896 + 605? (a) 2100 (b) 2300 (c) 2000 (d) 2200
  3. 3.Round 19.57 to one decimal place. =
  4. 4.Which is closest to 202 + 695 + 198? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  5. 5.Round 83.22 to one decimal place. =
  6. 6.Round 54.37 to one decimal place. =
  7. 7.Which is closest to 2798 ÷ 39? (a) 140 (b) 700 (c) 70 (d) 35
  8. 8.Round 83.33 to one decimal place. =
  9. 9.Round 98.86 to one decimal place. =
  10. 10.Round 54668 to the nearest thousand.
  11. 11.Which is closest to 505 + 301 + 495? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  12. 12.Which is closest to 298 × 30? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  13. 13.Round 28566 to the nearest ten.
  14. 14.Round 30.53 to one decimal place. =
  15. 15.Which is closest to 1503 ÷ 31? (a) 500 (b) 25 (c) 50 (d) 100
  16. 16.Which is closest to 299 × 38? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  17. 17.Round 58239 to the nearest hundred.
  18. 18.Which is closest to 604 ÷ 19? (a) 30 (b) 60 (c) 15 (d) 300
  19. 19.Which is closest to 504 × 19? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  20. 20.Which is closest to 803 × 20? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  21. 21.Which is closest to 1200 ÷ 31? (a) 400 (b) 20 (c) 40 (d) 80
  22. 22.Which is closest to 498 × 72? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  23. 23.Which is closest to 301 + 896 + 598? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  24. 24.Which is closest to 1492 ÷ 49? (a) 300 (b) 15 (c) 60 (d) 30
  25. 25.Round 5346 to the nearest ten.
  26. 26.Which is closest to 1508 ÷ 31? (a) 500 (b) 25 (c) 100 (d) 50
  27. 27.Round 10.59 to one decimal place. =
  28. 28.Which is closest to 805 ÷ 39? (a) 20 (b) 40 (c) 200 (d) 10
  29. 29.Which is closest to 596 × 42? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  30. 30.Round 19936 to the nearest ten.
  31. 31.Which is closest to 198 × 60? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  32. 32.Which is closest to 2994 ÷ 51? (a) 120 (b) 30 (c) 60 (d) 600
  33. 33.Which is closest to 1198 ÷ 29? (a) 80 (b) 400 (c) 20 (d) 40
  34. 34.Which is closest to 401 × 88? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  35. 35.Which is closest to 2803 ÷ 39? (a) 700 (b) 70 (c) 140 (d) 35
  36. 36.Which is closest to 199 × 68? (Round each number first.) (a) 28000 (b) 14000 (c) 1400 (d) 140000
  37. 37.Round 20471 to the nearest ten.
  38. 38.Which is closest to 902 × 92? (Round each number first.) (a) 81000 (b) 810000 (c) 162000 (d) 8100
  39. 39.Which is closest to 1996 ÷ 49? (a) 20 (b) 80 (c) 400 (d) 40
  40. 40.Round 84572 to the nearest hundred.

Answer key

  1. 1200
  2. 2100
  3. 19.6
  4. 1100
  5. 83.2
  6. 54.4
  7. 70
  8. 83.3
  9. 98.9
  10. 55000
  11. 1300
  12. 9000
  13. 28570
  14. 30.5
  15. 50
  16. 12000
  17. 58200
  18. 30
  19. 10000
  20. 16000
  21. 40
  22. 35000
  23. 1800
  24. 30
  25. 5350
  26. 50
  27. 10.6
  28. 20
  29. 24000
  30. 19940
  31. 12000
  32. 60
  33. 40
  34. 36000
  35. 70
  36. 14000
  37. 20470
  38. 81000
  39. 40
  40. 84600

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